Issues regarding the new NPS methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park :  oversight hearing before the Subcommittee on National Parks and Public Lands of the Committee on Resources, House of Representatives, One Hundred Sixth Congress, first session, May 25, 1999, Washington, DC. 
 Issues regarding the new National Park Service methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park 

 - 1 online resource (iii, 141 pages) :  illustrations, maps 
<br/><br/> "Serial no. 106-33."  CRDP Program record. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Airplanes--Noise--Government policy--Arizona--Grand Canyon National Park.<br/>Noise pollution--Government policy--Arizona--Grand Canyon National Park.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Grand Canyon National Park (Ariz.)
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Legislative hearings.
<br/><br/><label>GPO Item No.: </label>1023-C (online) 
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.R 31/3:106-33 
<br/><br/><label>Report. No.: </label>Serial no. 106-33 (United States. Congress. House. Committee on Resources)